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Coaxial holes

Jay_Q
I have attached a call out below. What would be the best way to report this out. They are 2 cylinders in line about .250” long each with a 2” space in between. I’ve tried to
1. level and origin on one then report the TP. Of the other
2. 3D best fit both cylinders trans and rotate and report of both cylinders using worst end of axis.
3. using geo-tol by selecting both cylinders with no datum

all of these came up with different results. Which is the best way? Any of these 3 or maybe some different ways?

Should both holes be reported out or just the one? Because technically one becomes datum in way.

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  • To me this is an understanding of what the customer wanted and then they used an illegal callout ( in Y14.5 anyways ) . The bottom portion of a composite has to have the exact DATUM STRUCTURE or lack of . A-B-C- TOP A-B-C- BOTTOM IS Legal. A-B-C TOP / A-B- BOTTOM is legal. A-B-C TOP / A bottom is legal. A-B-C- TOP / No datums on bottom is not legal. I don think you can just drop the A of the bottom.Now 2 separate callouts would be fine, but composite isn't. I'm going with VPT.SE on this one.

    In ASME Y14.5-2009, this is allowed

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  • To me this is an understanding of what the customer wanted and then they used an illegal callout ( in Y14.5 anyways ) . The bottom portion of a composite has to have the exact DATUM STRUCTURE or lack of . A-B-C- TOP A-B-C- BOTTOM IS Legal. A-B-C TOP / A-B- BOTTOM is legal. A-B-C TOP / A bottom is legal. A-B-C- TOP / No datums on bottom is not legal. I don think you can just drop the A of the bottom.Now 2 separate callouts would be fine, but composite isn't. I'm going with VPT.SE on this one.

    In ASME Y14.5-2009, this is allowed

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